//menu Drop Down Menu v2.01- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated: November 14th 06- added iframe shim technique

// convert all characters to lowercase to simplify testing
var agt=navigator.userAgent.toLowerCase();

var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);
var is_ie6    = (is_ie && (is_major == 4) && (agt.indexOf("msie 6.")!=-1) );
  
var horizontalOffset = 0;

var cssdropdown = {
    disappeardelay: 500, //set delay in miliseconds before menu disappears onmouseout
    disablemenuclick: false, //when user clicks on a menu item with a drop down menu, disable menu item's link?
    enableswipe: 1, //enable swipe effect? 1 for yes, 0 for no
    enableiframeshim: 1, //enable "iframe shim" technique to get drop down menus to correctly appear on top of controls such as form objects in IE5.5/IE6? 1 for yes, 0 for no


    //No need to edit beyond here////////////////////////
    dropmenuobj: null, ie: document.all, firefox: document.getElementById && !document.all, swipetimer: undefined, bottomclip: 0,

    getposOffset: function(what, offsettype) {

        var obj1 = document.getElementById("central_content").getBoundingClientRect(); ;
        horizontalOffset = obj1.left;

        var obj = what.getBoundingClientRect();
        var totaloffset = (offsettype == "left") ? obj.left - horizontalOffset : what.offsetTop - 1;

       
        //var totaloffset=(offsettype=="left")? 0: what.offsetTop;
        var parentEl = what.offsetParent;
        while (parentEl != null) {
            totaloffset = (offsettype == "left") ? totaloffset : totaloffset + parentEl.offsetTop;
            parentEl = parentEl.offsetParent;
        }
        return totaloffset;
    },

    swipeeffect: function() {
        if (this.bottomclip < parseInt(this.dropmenuobj.offsetHeight)) {
            this.bottomclip += 10 + (this.bottomclip / 10) //unclip drop down menu visibility gradually
            this.dropmenuobj.style.clip = "rect(0 auto " + this.bottomclip + "px 0)"
        }
        else
            return
        this.swipetimer = setTimeout("cssdropdown.swipeeffect()", 10)
    },

    showhide: function(obj, e) {
        if (this.ie || this.firefox)
            this.dropmenuobj.style.left = this.dropmenuobj.style.top = "-510px"
        if (e.type == "click" || e.type == "mouseover") {
            if (this.enableswipe == 1) {
                if (typeof this.swipetimer != "undefined")
                    clearTimeout(this.swipetimer)
                obj.clip = "rect(0 auto 0 0)" //hide menu via clipping
                this.bottomclip = 0
                this.swipeeffect()
            }
            obj.visibility = "visible"
        }
        else if (e.type == "click")
            obj.visibility = "hidden"
    },

    iecompattest: function() {
        return (document.compatMode && document.compatMode != "BackCompat") ? document.documentElement : document.body
    },

    clearbrowseredge: function(obj, whichedge) {
        var edgeoffset = 0
        if (whichedge == "rightedge") {
            var windowedge = this.ie && !window.opera ? this.iecompattest().scrollLeft + this.iecompattest().clientWidth - 15 : window.pageXOffset + window.innerWidth - 15
            this.dropmenuobj.contentmeasure = this.dropmenuobj.offsetWidth
            if (windowedge - this.dropmenuobj.x < this.dropmenuobj.contentmeasure)  //move menu to the left?
                edgeoffset = this.dropmenuobj.contentmeasure - obj.offsetWidth
        }
        else {
            var topedge = this.ie && !window.opera ? this.iecompattest().scrollTop : window.pageYOffset
            var windowedge = this.ie && !window.opera ? this.iecompattest().scrollTop + this.iecompattest().clientHeight - 15 : window.pageYOffset + window.innerHeight - 18
            this.dropmenuobj.contentmeasure = this.dropmenuobj.offsetHeight
            if (windowedge - this.dropmenuobj.y < this.dropmenuobj.contentmeasure) { //move up?
                edgeoffset = this.dropmenuobj.contentmeasure + obj.offsetHeight
                if ((this.dropmenuobj.y - topedge) < this.dropmenuobj.contentmeasure) //up no good either?
                    edgeoffset = this.dropmenuobj.y + obj.offsetHeight - topedge
            }
        }
        return edgeoffset
    },

    dropit: function(obj, e, dropmenuID) {
        if (this.dropmenuobj != null) //hide previous menu
            this.dropmenuobj.style.visibility = "hidden" //hide menu
        this.clearhidemenu()
        if (this.ie || this.firefox) {

            this.dropmenuobj = document.getElementById(dropmenuID)

            obj.onmouseout = function() { cssdropdown.delayhidemenu() }
            obj.onclick = function() { return !cssdropdown.disablemenuclick } //disable main menu item link onclick?
            this.dropmenuobj.onmouseover = function() { cssdropdown.clearhidemenu() }
            this.dropmenuobj.onmouseout = function(e) { cssdropdown.dynamichide(e) }
            this.dropmenuobj.onclick = function() { cssdropdown.delayhidemenu() }


            this.showhide(this.dropmenuobj.style, e)

            this.dropmenuobj.x = this.getposOffset(obj, "left")
            this.dropmenuobj.y = this.getposOffset(obj, "top")
            this.dropmenuobj.style.left = this.dropmenuobj.x - this.clearbrowseredge(obj, "rightedge") + "px"

            this.dropmenuobj.style.top = this.dropmenuobj.y - this.clearbrowseredge(obj, "bottomedge") + obj.offsetHeight + 1 + "px"
            this.positionshim() //call iframe shim function
        }
    },

    positionshim: function() { //display iframe shim function
        if (this.enableiframeshim && typeof this.shimobject != "undefined") {
            if (this.dropmenuobj.style.visibility == "visible") {
                this.shimobject.style.width = this.dropmenuobj.offsetWidth + "px"
                this.shimobject.style.height = this.dropmenuobj.offsetHeight + "px"
                this.shimobject.style.left = this.dropmenuobj.style.left
                this.shimobject.style.top = this.dropmenuobj.style.top
            }
            this.shimobject.style.display = (this.dropmenuobj.style.visibility == "visible") ? "block" : "none"
        }
    },

    hideshim: function() {
        if (this.enableiframeshim && typeof this.shimobject != "undefined")
            this.shimobject.style.display = 'none'
    },

    contains_firefox: function(a, b) {
        while (b.parentNode)
            if ((b = b.parentNode) == a)
            return true;
        return false;
    },

    dynamichide: function(e) {
        var evtobj = window.event ? window.event : e
        if (this.ie && !this.dropmenuobj.contains(evtobj.toElement))
            this.delayhidemenu()
        else if (this.firefox && e.currentTarget != evtobj.relatedTarget && !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))
            this.delayhidemenu()
    },

    delayhidemenu: function() {
        var option = cssdropdown.dropmenuobj.id;
        option = option.substring(option.length - 1);
        var imgObj = document.getElementById('img' + option)
        var hideImage = "";
        this.delayhide = setTimeout(hideImage + "cssdropdown.dropmenuobj.style.visibility='hidden'; cssdropdown.hideshim();", this.disappeardelay) //hide menu
    },

    clearhidemenu: function() {
        if (this.delayhide != "undefined")
            clearTimeout(this.delayhide)
    },

    startmenu: function() {
        for (var ids = 0; ids < arguments.length; ids++) {
            var menuitems = document.getElementById(arguments[ids]).getElementsByTagName("a")
            for (var i = 0; i < menuitems.length; i++) {
                if (menuitems[i].getAttribute("rel")) {
                    var relvalue = menuitems[i].getAttribute("rel")
                    menuitems[i].onmouseover = function(e) {
                        var event = typeof e != "undefined" ? e : window.event
                        cssdropdown.dropit(this, event, this.getAttribute("rel"))
                    }

                }
            }
        }

        if (window.createPopup && !window.XmlHttpRequest) { //if IE5.5 to IE6, create iframe for iframe shim technique
            document.write('<IFRAME id="iframeshim"  src="/iframemenu.htm" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>')
            this.shimobject = document.getElementById("iframeshim") //reference iframe object
        }
    }

}